Glossary
GL-6
Issue 2 May 1995
L
LAPM
Link Access Protocol for Modems, used in V.42 and V.42bis
modes.
loopback test
Any test that verifies the integrity of a device by sending data
from one device to another, and then checking the received data
for errors. Various loopback tests can be used to isolate a
problem to the computer, modem, or telephone line.
M
MNP
Microcom Networking Protocol. Levels 2—4 of this protocol
detect and correct data errors caused by poor telephone line
conditions. Level 5 includes data compression.
modem
MOdulator/DEModulator. A device used to convert data from a
digital signal to an analog signal so that data can be transmitted
over a telephone line. Once the data is received, the analog
signal is converted back into a digital signal.
modem port
The modem port is the connection between the modem and the
telephone line.
modulation
A modem modulation is a set of guidelines that determines
how the modems connect and at what speed they communicate.
Modulations, such as V.34, V.32bis, V.32, V.22bis, V.22,
Bell 212A, and Bell 103, have a maximum and minimum data
rate.
See also data rate.
